Electron-nuclear double resonance resonator

Abstract

An electron-nuclear double resonance resonator, having a loop-gap resonator and an elongated lead; the loop-gap resonator comprises a plurality of arc-shaped conductive plates, and the elongated lead connects the arc-shaped conductive plates into a radio-frequency coil; the loop-gap resonator resonates at an electron resonance frequency, and the radio-frequency coil resonates at a nuclear resonance frequency; with the structure of the loop-gap resonator, the separation between an electric field and a magnetic field can be accelerated to ensure the maximization of the ratio of the magnetic field to the electric field inside a resonant resonator; and with the elongated lead, the impact of the lead to a resonance frequency and the mode of the loop-gap resonator is prevented as much as possible, and meanwhile the conductive plates of the loop-gap resonator can be connected into the radio-frequency coil.

We claim: 
     
       1. An electron-nuclear double resonance resonator, comprising
 a plurality of pairs of arc-shaped conductive plates, each of the arc-shaped conductive plates having side edges and being circumferentially distributed, two pairs of the arc-shaped conductive plates opposing each other and in each pair of the two pairs, the arc-shaped conductive plates facing each other with a recess on the adjacent side edge, and the recesses of the pairs of the arc-shaped conductive plates forming two radio-frequency coil windows, the plurality of the pairs of the arc-shaped conductive plates forming a cylindrical loop-gap resonator with the two radio-frequency coil windows, and the two radio-frequency coil windows being provided on the cylindrical loop-gap resonator opposing each other, 
 a lead connecting each of the arc-shaped conductive plates in series in turn to form a radio frequency coil that is a saddle-shaped coil having a same diameter as the cylindrical loop-gap resonator, 
 wherein 
 the radio-frequency coil generates a radio-frequency magnetic field that passes through the two radio-frequency coil windows in turn. 
 
     
     
       2. The electron-nuclear double resonance resonator according to  claim 1 , wherein the two radio-frequency coil windows are distributed symmetrically with respect to an axial center of the loop-gap resonator. 
     
     
       3. The electron-nuclear double resonance resonator according to  claim 1 , wherein a number of the arc-shaped conductive plates is 2 times n, and n is an integer that is 2 or more. 
     
     
       4. The electron-nuclear double resonance resonator according to  claim 1 , further comprising
 a microwave coupling loop disposed in the loop-gap resonator and being coaxial with the loop-gap resonator, 
 wherein a distance between the microwave coupling loop and the loop gap resonator is regulated to adjust coupling effect between the microwave coupling loop and the loop-gap resonator. 
 
     
     
       5. The electron-nuclear double resonance resonator according to  claim 1 , further comprising
 a tuning capacitor being connected to two terminals of the radio-frequency coil in parallel, 
 a matching capacitor having one end being connected to one end of the tuning capacitor and the other end forming one end of a radio-frequency interface, and the other end of the tuning capacitor forming the other end of the radio-frequency interface.